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                [Usaco2006 Feb]Cellphones 手机                </h1>
                <p>时间限制：1s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><p class="MsoNormal"><span style="font-size: medium; "><br />
</span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="font-family: 宋体; ">奶牛的名字都是由英文字母表的前L</span><span lang="EN-US">(1</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">L</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">26)</span><span style="font-family: 宋体; ">个字母构成的．现在想设计一种手机，有</span><span lang="EN-US">B(1</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">B</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">L)</span><span style="font-family: 宋体; ">个按键．请你把这</span><span lang="EN-US">L</span><span style="font-family: 宋体; ">个字母按顺序分配给</span><span lang="EN-US">B</span><span style="font-family: 宋体; ">个按键，使能够通过按这些键而唯一确定的奶牛数尽量多．</span></span></p>
<p class="MsoNormal"></p>
<p></p></p><hr/><h3>输入格式</h3><p><div></div>
<div>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp; &nbsp;&nbsp;</span><span style="font-family: 宋体; ">第</span><span lang="EN-US">1</span><span style="font-family: 宋体; ">行，</span><span lang="EN-US">B</span><span style="font-family: 宋体; ">和</span><span lang="EN-US">L</span><span style="font-family: 宋体; ">．</span></span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="font-family: 宋体; ">第</span><span lang="EN-US">2</span><span style="font-family: 宋体; ">行，正整数</span><span lang="EN-US">N(1</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">N</span><span style="font-family: 宋体; ">&le;</span><span lang="EN-US">1000)</span><span style="font-family: 宋体; ">．</span></span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="font-family: 宋体; ">接下来</span><span lang="EN-US">N</span><span style="font-family: 宋体; ">行，一行一个奶牛的名字．</span></span></p>
<p class="MsoNormal"></p>
<p class="MsoNormal"></p>
</div>
<p></p></p><hr/><h3>输出格式</h3><p><div></div>
<div>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp; &nbsp;&nbsp;</span><span style="font-family: 宋体; ">第</span><span lang="EN-US">1</span><span style="font-family: 宋体; ">行，输出能够通过按键唯一确定的牛数．</span></span></p>
<p class="MsoNormal"><span style="font-size: medium; "><span lang="EN-US">&nbsp;&nbsp;&nbsp;&nbsp;</span><span style="font-family: 宋体; ">第</span><span lang="EN-US">2</span><span style="font-family: 宋体; ">到</span><span lang="EN-US">B+1</span><span style="font-family: 宋体; ">行，输出</span><span lang="EN-US">1</span><span style="font-family: 宋体; ">到</span><span lang="EN-US">B</span><span style="font-family: 宋体; ">这</span><span lang="EN-US">B</span><span style="font-family: 宋体; ">个按键分别代表什么字母．</span></span></p>
<p class="MsoNormal"></p>
<p class="MsoNormal"></p>
</div>
<p></p></p><hr/><h3>样例输入</h3><pre>    1
    3  13
    1 1
    ALL
    BALL
    BELL
    CALK
    CALL
    CELL
    DILL
    FILL
    FILM
    ILL
    MILK


    </pre><hr/><h3>样例输出</h3><pre>    7
    AB
    CDEFGHIJK
    LM

样例说明
    A到M这M个字母，按顺序被分成3份，分别由按键1到3表示．
    按键1代表AB，按键2代表C到K，按键3代表LM.但是CELL，DILL，FILL和FILM这4个名字都要通过按2233实现，这4个名字不是唯一确定的．所以唯一确定的名字只有7个．</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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